People really need to see more than the surface, you try having your world destroyed at 7 years of age, sent to a hell of an island, and try to stay completely sane.
Tonari is hardly the best of people, but she is hardly the worse, her forceful way is a coping mechanism and not the worst one, she may annoy the Fushi but she is still putting herself in harm's way to help him.
So i will give a piece of advice, not one you need to follow but i will say it nonetheless... dont waste time hating people until the proven what they are made of, because if you just hate someone because of first impressions in a story like this you will only impair your judgment... well except that crazy bitch, that one was hateful from panel one.